If
f(x)=2x(sinx+cosx), find
f′(x).
f′(x) =
Evaluate the derivative at
x=4. Enter an approximation, rounded to the nearest thousandth.
f′(4) =
[more..]
Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity